End cap for a tube



FIG. 1 is a top perspective view of a end cap for a tube showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, the other sides being the same as the side shown; and

FIG. 4 is a bottom plan view. 

The ornamental design for an end cap for a tube, as shown and described. 